My pets haven't had dolls, but Jasper had a stuffed dog that he was very attached to and my former cat, Mr. Smartypants (yes, his name, really) has a bear. He loves his stuffed bear so much...he carries it all over the house with him and the hair is gone on the top of the bear's head from him loving it with kisses and grooming! He lives with a former roommate now (the cats became too attached to one another to be separated) and I just heard he still has the bear.